How to select and purchase fans for the plant
Release time：
2022-08-25
The fan model shall be selected according to the actual situation of the plant, and the fan model matching the original window size shall be selected as far as possible. The fan and the wet curtain shall be kept at a certain distance (installed on both sides of the gable of the plant as far as possible) to achieve good ventilation effect. The exhaust side shall not be close to the nearby buildings as much as possible to avoid affecting the nearby residents. Fan air pressure: refers to the resistance to be overcome in the process of conveying so many air volumes, and refers to the pressure rise. However, domestic fans are generally selected according to full pressure, while foreign fans are generally selected according to pressure rise. External residual pressure=total pressure of fan resistance of each processing section of the air cabinet. The resistance of the air supply and return duct is generally 7~8Pa/m, and the resistance of 90 ° elbow is 10Pa/piece. Empirical formula: external residual pressure=total pressure of fan - resistance fan power of each treatment section (W)=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/force rate (75%) Total pressure=static pressure+dynamic pressure. Fan motor power (W)=fan power (W) * 130%=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/power ratio (75%) * 130%
The fan model shall be selected according to the actual situation of the plant, and the fan model matching the original window size shall be selected as far as possible. The fan and the wet curtain shall be kept at a certain distance (installed on both sides of the gable of the plant as far as possible) to achieve good ventilation effect. The exhaust side shall not be close to the nearby buildings as much as possible to avoid affecting the nearby residents.
Fan air pressure: refers to the resistance to be overcome in the process of conveying so many air volumes, and refers to the pressure rise. However, domestic fans are generally selected according to full pressure, while foreign fans are generally selected according to pressure rise. External residual pressure=total pressure of fan resistance of each processing section of the air cabinet. The resistance of the air supply and return duct is generally 7~8Pa/m, and the resistance of 90 ° elbow is 10Pa/piece.
Empirical formula: external residual pressure=total pressure of fan - resistance fan power of each treatment section (W)=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/force rate (75%) Total pressure=static pressure+dynamic pressure. Fan motor power (W)=fan power (W) * 130%=air volume (L/S) * air pressure (Kpa)/efficiency (75%)/power ratio (75%) * 130%
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